问题描述：
改同义句My mother is ill.l must look after her at home.
My mother is ill.l must look after her at home.
My mother is ill.l _ _ look after her at home.
At last my parents went to beijing by plane.
_ _ _my parents went to beijing by plane.
The girl is afraid to go out alone at night.
The girl is afraid _ _out alone at night.
My mother is ill.l must look after her at home.
My mother is ill.l _ _ look after her at home.
At last my parents went to beijing by plane.
_ _ _my parents went to beijing by plane.
The girl is afraid to go out alone at night.
The girl is afraid _ _out alone at night.
问题解答：
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